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最後の脱氷期における東南赤道と北アフリカの降雨量の一貫した変化

Bette L Otto-Bliesner¹, James M Russell², Peter U Clark³

¹Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO 80307-3000, USA. ottobli@ucar.edu.

Science (New York, N.Y.)

|December 6, 2014

まとめ

~14,700年前のアフリカの気象条件は,複雑な気候変動によって引き起こされました. 大西洋の南極反転循環 (AMOC) と温室効果ガス (GHG) の変化は,大陸全体の降雨パターンに影響を与えました.

科学分野:

古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
気候モデリング
アフリカの気候ダイナミクス

背景:

初期のアフリカ湿気期 (約14,700年前) は,赤道アフリカと北アフリカ全体で急激な湿気が発生した.
この現象の説明は,季節的な太陽照射パターンが相反しているため難しい.
氷退期の気候の動態を理解することは,将来の気候変動を予測するために不可欠です.

研究の目的:

最後の脱氷期におけるアフリカ熱帯の降雨量の変化のメカニズム的理解を図る.
初期のアフリカ湿気期の突然の始まりと半球的な一貫性の背後にあるドライバーを調査する.

主な方法:

暫定的な気候モデルのシミュレーションを使用しました.
アフリカにおける脱氷期気候の動態と降雨パターンを分析した.

主要な成果:

融水による大西洋南部転覆循環 (AMOC) の減少は,当初,北アフリカと南アフリカの両方で降雨を抑制しました.
AMOCの回復後,北アフリカの湿気は,夏の熱帯熱帯雨と温室効果ガス (GHG) の濃度の増加によって引き起こされました.
南アフリカの湿化は,主に温室効果ガスの濃度の増加への反応でした.

結論:

大西洋南極反転循環 (AMOC) は,アフリカ気候の初期の脱氷期を調節する上で重要な役割を果たしました.
温室効果ガスの濃度と太陽照射パターンは,北アフリカと南アフリカにおける降水量に影響を及ぼした.
この研究は,初期のアフリカの湿気期に機械的な説明を提供し,海洋循環,太陽照射,温室効果ガスの複雑な相互作用を強調しています.

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